http://www.aluriasoftware.com
It's a good program.. You'll be surprised what it will find... I use it and no-problems... A must if your downloading MP3's and other files.. Alot of pricks lay a small section of code in the file your downloading.. and depending on what application you use to open it.. it runs.. then it makes changes to your system.. like reasigning the homepage.. and making a permenant connection to a server.. stuff like that...